#include<bits/stdc++.h>
using namespace std;
int a,b,cnt;bool f[10];
int main()
{
	cin >> a >> b;
	for (int i=a;i<=b;i++)
	{
		memset(f,0,sizeof(f));
		int j=i,q=0,p=1;
		while (j)
		{
			f[j%10] = 1;
			j /= 10,q++;
		}
		if (p) for (int i=0;i<q;i++)
		if (!f[i]) {p=0;break;}
		if (p) cnt++;
	}
	cout << cnt;
	return 0;
}